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XYZ Machine Tools Ltd
XYZ Bed Mill Safety, Installation, Maintenance, Service & Parts List Manual
Figure 40 - Saddle Bottom Gib Adjustment – SMX 2500 & 3500
5.2.1.5
Saddle Bottom Gib Adjustment, Y-Axis – SMX 4000 & 5000
It is unrealistic to adjust the Y bottom ways the same way as we do on the SMX 3500 because of the
extra weight of the saddle and table.
1.
Clean all swarf, dirt and excess oil from the table and saddle.
2.
Centre the saddle on the bed ways.
3.
Mount your indicator on the left side of the saddle (Point C) with the table in the centre of its
travel and zero out your indicator.
4.
Then move the table all the way to the right side. When the gibs are adjusted properly you
should see no more than 0.008mm movement on the indicator.
5.
Do the same thing on the right side of the saddle (Point B) this time moving the table all the
way to the left. The reading should be positive on the indicator because the saddle should
rise where you are indicating.
Note: You can get better readings than 0.008mm but the torque on the Y ball screw may
exceed our recommended levels. Remove the ball screw cover and check the torque with an
in-lb torque wrench. Normally, the torque should be around 15 in-lbs. Do not exceed 20 in-
lbs. Values higher than this may cause circularity problems.
See Figure 30b for an illustration.
